Carb

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Feb 8, 1998
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> The carb on my 76 GB is a 7045254. That part
> of the number looks good. The problem is the rest of the number.
> The last part of mine is ZS not the 70 50D CJV listed.

Arch,

Those last digits are not part of the part number.

70 is the primary jet
50D is the primary metering rod
CJ is the secondary metering rod
V is the primary rod hanger

You're good to go.

> I would like to rebuild the carb if it is the right one.

You might want to consider the carb rebuilder that Paul Bartz used. He was
very pleased with the result. Don't remember the name, but if you're
interested, maybe he'd be kind enough to post it one more time.

Patrick
 
>
> My friend has rebuilt many of these. Thought we would do it ourselves.
> Do you advise against this? Let me know.

I rebuilt my own also. The only downside is if the airhorn is warped -
fairly common(mine is - living with it for now, but either a replacement air
horn or carb is on the short list). The guys that specialize in these
things usually have a boneyard of old ones for spare parts. Order some 72
primary jets(part no. 7031972) to compensate for enleanment while your in
there.

Patrick
 
>
> In a message dated 10/8/99 9:03:33 AM Central Daylight Time,

>
> >
> > 70 is the primary jet
> > 50D is the primary metering rod
> > CJ is the secondary metering rod
> > V is the primary rod hanger
> >
> Patrick
>
> Is this the original configuration? Seems like I read about some
> update to this. If you cant tell I am not strong on crabs-----and my
> friend is not strong on computers but together we are He** on wheels.

Yep - get out your reading glasses. You can read the primary jet number
on the top of the jet. The rod numbers are etched on the side of the rod(I
had to stand outside on a sunny day to see this). Back in May, I talked to
a Mondello tech rep that recommended you go up two jet sizes if you're not
changing cams. So, if you're gonna' call Mondello anyway, see what he
recommends if you are changing cams.

Patrick
 
It's: A&G Carburetor, 6136 W Roosevelt, Oak Park IL 60304, 708-386-9804.

I was very impressed with their customer service. I called them a half
dozen times asking questions and they always carefully answered/explained
everything to my satisfaction.

I sent my carburetor via UPS on a Monday and had it back on Friday of that
week.

Although they told me I would have to final adjust the idle speed and idle
mixture, I've never touched either yet, and that was back in Sep 1996.

Paul Bartz

From: Patrick.Flowers
[mailto:Patrick.Flowers]
Sent: Friday, October 08, 1999 10:03 AM

The carb on my 76 GB is a 7045254. That part of the number looks good. The
problem is the rest of the number. The last part of mine is ZS not the 70
50D CJV listed.

Arch,

Those last digits are not part of the part number.

70 is the primary jet
50D is the primary metering rod
CJ is the secondary metering rod
V is the primary rod hanger

You're good to go.

> I would like to rebuild the carb if it is the right one.

You might want to consider the carb rebuilder that Paul Bartz used. He was
very pleased with the result. Don't remember the name, but if you're
interested, maybe he'd be kind enough to post it one more time.

Patrick
 
Arch:

As I recall, ~ $139.00.

They use a leather accelerator pump, sealed the bowl plugs with epoxy, and
include a spare needle and bowl gasket. Their 8-step washing process got
the exterior so clean and shinny that you could eat off of it. I thought
they sprayed something on it.

Although my records are at home so I can't verify it now, I believe they
even included a new choke vacuum pull-off pot in the deal.

Paul Bartz

From: Gcbr [mailto:Gcbr]
Sent: Friday, October 08, 1999 11:06 AM

In a message dated 10/8/99 9:34:20 AM Central Daylight Time,

> Although they told me I would have to final adjust the idle speed and idle
> mixture, I've never touched either yet, and that was back in Sep 1996.
>
Paul

How much $$$$$$ for rebuild.
 
I think I'd go ahead and use the 72 primaries. IIRC, these engines were
designed to run a little lean in the 70's and with today's reformulated
fuels, I can't see that two jet sizes would hurt a thing. Worst case, it
could be a little rich, but I doubt it will be.

That's completely seat of my pants, but it's what I'd do,
Patrick

>
> Joe Mondello told me to leave the jet size alone for now. See how it
> runs with the new cam. I got the JM-16-18. Thats a fine recommendation
> but I dont want to go back in once I get done. Any other thoughts on
> going to a 72 primary jet?
>
> Take Care
> Arch
>
 
Arch,

The only motorhome difference in the QJet is the jet and rod sizes. Got my
rebuild kit from Dick Paterson at Myrtle Beach. It was a standard Delco
package. I'll get the number off the box tonight.

Patrick

> Did you have to tell them it was for a motorhome. There was an
> earlier post that something was different on the motorhome. I
> called Cinnabar and was told they did not have a rebuild kit. Now
> what?
>
> Take Care
> Arch
>
 
Arch,

The kit is ACDelco Part No. 17076057, $25 from Paterson at Myrtle
Beach.

Patrick

>
> The only motorhome difference in the QJet is the jet and rod sizes. Got my
> rebuild kit from Dick Paterson at Myrtle Beach. It was a standard Delco
> package. I'll get the number off the box tonight.
- --
Patrick Flowers
Mailto:patrick

The GMC Motorhome Page
http://www.gmcmotorhome.com
 
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